Wiring
Wire Size
Page 10 MDE-4567D 9820K Series AST Pumps Installation and Operation Manual · January 2020
Model 9820K
The AC wire size for the Micro Feed and Neutral should be 14 AWG. This gauge of wire will
be sufficient for runs up to 300 feet from the breaker panel to the pumping unit. Sites with
distances over 300 feet should use 12 AWG wire.
The AC wire size for the Slow Flow and Fast Flow lines should be 14 AWG (when they are
used).
The DC wire size for the Pulser lines connecting the pumping unit to the AST register
assembly must use 4-conductor, 18 AWG shielded cable (Belden 89418, Gasboy P/N
C08864). This cable allows the pulser wires to run in the same conduit as the AC wiring for
the short distance between the pumping unit and the register assembly. Belden 89418 is rated
as follows:
• Gas and oil-resistant insulation and jacket
• 18 AWG tinned, stranded, copper
• Four conductors
• 300 Volt maximum operating voltage
• Aluminum/Mylar shielded with drain wire
Twisted-pair shielded cable is highly recommended for the Pulse Output or RS-485 field
wiring (when they are used). This type of cable provides superior noise immunity and must be
used for distances over 100 feet or any time pulse output or RS-485 wiring is included in the
same conduit as the AC wires. This cable must meet the following specifications:
• Conductor: 18 AWG stranded wire. 2 twisted-pairs.
• Shield: Foil-wrapped 100% coverage and/or tinned copper braid 90% coverage
• Drain Wire: Stranded, tinned copper, 20 AWG or larger/or braided shield
• Voltage Rating: Maximum operating voltage of 600V
• Environmental: Gas and oil-resistant; suitable for wet or dry locations.
Gasboy can supply Belden 1063A (P/N C09655) which is a UL-listed, 4-conductor cable that
meets the requirements listed above.
Note: Belden 1063A is UL-Listed but not CSA-listed.
Cable with a voltage rating of less than 600 V must be installed in a conduit separate from all
AC wires.
See the Gasboy Fuel Management System Installation Manual for specific requirements.